Synthetic Route of C3H9OP. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Trimethylphosphineoxide, is researched, Molecular C3H9OP, CAS is 676-96-0, about Evaluating Halogen-Bond Strength as a Function of Molecular Structure Using Nuclear Magnetic Resonance Spectroscopy and Computational Analysis. Author is Dang, Quang Minh; Simpson, Jeffrey H.; Parish, Carol A.; Leopold, Michael C..
Halogen bonding (XB) is a highly directional, noncovalent intermol. interaction between a mol. (XB donor) presenting a halogen with an electron-deficient region or sigma hole (σ-hole) and an electron-rich or Lewis-base mol. (XB acceptor). A systematic, exptl., and theor. study of solution-phase XB strength as a function of the mol. structure for both XB donor and acceptor mols. is presented. The impact of specific structural features is assessed using 19F and 1H NMR titrations to determine association constants, d. functional theory calculations for interaction energies and bond lengths, as well as 19F-1H HOESY NMR measurements of intermol. cross-relaxation between the interacting XB donor-acceptor adducts. For XB donor mols. (perfluoro-halogenated benzenes), results indicate the critical importance of iodine coupled with electron-withdrawing entities. Prominent structural components of XB acceptor mols. include a central atom working in conjunction with a Lewis-base atom to present high electron d. directed at the σ-hole (e.g., tributylphosphine oxide). Addnl., larger surrounding aliphatic R groups (e.g., Bu and octyl) were found to significantly stabilize strong XB, particularly in solvents that promote the interaction. With a more thorough understanding of structure-optimized XB, one can envision harnessing XB interactions more strategically for specific design of optimal materials and chem. applications.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem